Well Eheim's website lists the 1048 and the 1250 (my pump) as being 1/2. Since I know mine is 1/2 ID, I'll assume yours was also measuring ID.
Strechy 3/8 ID will. My 1250 also has a 3/4 inch fitting that I streched 1/2 tube over. Actually I prefer it like this because the seal is extremely tight.
If not a reducing fitting is $1.50 at your local Acehardware or Home Depot. Its just a double sided barb that is 1/2 on one side and 3/8 on the other. Put tube on either side and its good to go.
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